CVE-2004-0329 in FreeChat
Summary
by MITRE
FreeChat 1.1.1a allows remote attackers to cause a denial of service (crash) via certain unexpected strings, as demonstrated using "aaaaa".
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Analysis
by VulDB Data Team • 06/22/2018
The vulnerability identified as CVE-2004-0329 affects FreeChat version 1.1.1a, a chat application that was widely used in early internet communication systems. This particular flaw represents a classic buffer overflow condition that manifests through improper input validation mechanisms within the application's string processing functions. The vulnerability specifically occurs when the application encounters certain malformed input strings that exceed expected parameter limits, leading to unpredictable application behavior and eventual system instability.
The technical implementation of this vulnerability stems from inadequate bounds checking in the chat application's message handling routines. When the system processes input strings such as the demonstrated "aaa" sequence, it fails to properly validate the length and content of incoming data before attempting to process or store it in memory buffers. This lack of input sanitization creates a condition where the application's memory management routines become corrupted, resulting in application crashes and system-wide denial of service conditions. The vulnerability operates at the application layer and requires no special privileges to exploit, making it particularly dangerous as it can be triggered by any remote user with access to the chat service.
The operational impact of this vulnerability extends beyond simple application crashes to encompass broader service availability concerns. When exploited successfully, the vulnerability can cause continuous disruption to chat services, potentially affecting multiple users simultaneously if the application is widely deployed. This type of denial of service condition can be particularly damaging in environments where real-time communication is critical, such as customer support systems, collaborative work platforms, or emergency response communications. The vulnerability's exploitation is straightforward and requires minimal technical knowledge, making it a popular target for malicious actors seeking to disrupt service availability.
Security practitioners should recognize this vulnerability as a variant of CWE-121, which describes buffer overflow conditions in stack-based buffers, and CWE-122, which addresses heap-based buffer overflows. The vulnerability also aligns with ATT&CK technique T1499.004, which covers network denial of service attacks through exploitation of application vulnerabilities. Mitigation strategies should focus on immediate patching of the affected FreeChat version, implementation of input validation controls, and deployment of network monitoring solutions to detect potential exploitation attempts. Additionally, organizations should consider implementing application-level firewalls and input sanitization measures to prevent similar vulnerabilities from affecting other applications in their infrastructure. The remediation process should include comprehensive testing to ensure that patched versions properly handle all forms of malformed input while maintaining full functionality of the chat service.